I installed Monterey 12.0.1 couple of days ago. External monitor (thunderbolt - displayport) stopped working during update. It's not even regonized. HDMI-HDMI works though. I'm using Early 2015 macbook pro. I tried everything. Resetting SMC, NVRAM & PRAM, re-installing monterey, installed catalina, linux and windows. It just isn't working anywhere.